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Amplifiers sold for analog TV will work for digital too.
Just a caution - the inexpensive ones (as found at R-S, for example) may go for the "bigger is better" philosophy (i.e., more dB gain) at the expense of stability, and as a result may be unstable and oscillate. It is better to buy a 10 dB amp and see if that helps than to get a higher gain one that sometimes produces its own interference. The purpose of this amp is NOT to make the signal MUCH bigger, unless you are planning to reduce it by going through a splitter to multiple receivers. The purpose of this amp is to have a good noise figure and get the signal strong enough that the noise figure of the tuner in your converter box no longer matters. In case of a long antenna lead, the purpose is also to compensate lead losses. If you don't have significant lead-in losses, 3 or 4 dB of gain is all that's really needed, the rest is just insurance, and too much is asking for trouble.
IF you are trying to receive a weak signal in an area with other strong signals, adding an amplifier may actually make things worse due to overload, so you need to try it under your conditions.
Higher price pro gear with good grounds, used with well-shielded cables, generally doesn't have the oscillation problems, but can still be overloaded if a high-gain amp is used under strong signal conditions.
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